Three-check
The game follows the usual rules of chess, with one more way to win.
Winning
You win as soon as you give your opponent the third check of the game. Every check counts, including a discovered check. Each side's checks are shown under the board. Checkmate and stalemate work as usual.
Draws and time
A draw for insufficient material happens only with two lone kings. A player who runs out of time loses, unless the opponent has only a king left: then the game is drawn.